Shutdown of automatic ignition controls upon valve relay failures
a technology of automatic ignition control and valve relay, which is applied in the direction of valves, relays, operating means/releasing devices, etc., can solve the problems of failure of both relays, power supply disconnection, and inability to shut down the power supply to the gas valv
Active Publication Date: 2021-02-25
CARRIER CORP
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AI Technical Summary
Benefits of technology
The invention provides a protection switch that prevents accidental transmission of power when the first and second relay coils are in a failed state.
Problems solved by technology
However, in case of failure of both the relays, the power is directly supplied to the gas valve making the gas valve ON without any command from a controller.
Although the current ignition control systems that are known in the art are able to detect failure of the relays conducting the power supply at the startup of the system, still they are unable to disconnect the power supply.
Such a situation may lead to a disaster.
Considering a scenario wherein the ignition control system is in a “power up” or “standby” mode and there is a failure of both the relays.
In this case, the system is able to detect the relay failure but is unable to shut down the power supply to the gas valve.
Consequently, the gas valve turns on which may lead to some mishappening.
This is because even a transmission of power supply for a few seconds to the gas valve which may lead to explosion.
In this case, if the system is unable to detect the relay failures till next power up, again the system is unable to shut off the power of the gas valve.
This leads to wastage of fuel and generation of unwanted heat and may also lead to an accident
Method used
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[0031]Described herein is the technology with a circuit and a method for safe shutdown of automatic ignition control upon valve relay failures. The circuit comprises a valve drive circuit comprising relay coils, a controller and a protection switch. Whenever there is a failure of both the valve relays, the failsafe circuitry isolates power from being conducted to the valve ensuring the valve closure.
[0032]As used herein, the relay coils may include, but not limited to, Direct Current (DC) relays, Alternate Current (AC) relays, Induction type relays, Magnetic latching relays, Reed relay coupled solid state relays (SSRs), Transformer coupled SSRs, Photo coupled SSRs, Hybrid relays or any other such electric component known in the art, that can be energized to conduct power supply.
[0033]As used herein, the controller may include, but not limited to, Programmable Logic Controllers (PLCs), Distributed Control Systems (DCS), Process Control Systems (PCS), Safety Control Systems (SCS) or a...
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A circuit and a method for shutdown of automatic ignition controls upon valve relay failures. One or more embodiments describe a method including controlling a power supply to a valve by a valve drive circuit, the valve drive circuit comprising a first relay coil and a second relay coil. The method also includes controlling the valve drive circuit by checking the first relay coil and the second relay coil and issue a drive signal to the first relay coil and the second relay coil. The method further includes protecting from accidental supply of power by a protection switch based on the drive signal issued by the controller.
Description
FOREIGN PRIORITY[0001]This application claims priority to Indian Patent Application No. 201911033900, filed Aug. 22, 2019, and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference.TECHNICAL FIELD OF INVENTION[0002]The present invention relates generally to safety systems in industrial plants. More particularly, the invention relates to a circuit and a method for safe shutdown of automatic ignition controls upon valve relay failures.BACKGROUND OF THE INVENTION[0003]Generally, any appliance that utilizes gas for its functioning is provided with a gas control valve to regulate the pressure and the amount of gas supplied to the appliance for working. This is done to ensure safety of the user during operation of the appliance. In the current control systems known in the art, dual gas valve relay systems are present. If one relay fails to operate, the other one comes into play ensuring safe shutdown of the ap...
Claims
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IPC IPC(8): H02H7/20H01H47/22H01H47/00F16K31/02
CPCH02H7/20F16K31/02H01H47/002H01H47/22H02H11/00
Inventor CHAVALA, VENKATA NARASIMHA RAOMEDEPALLI, SUDHIR RAJAPATURU, SOWMYA
Owner CARRIER CORP